package com.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 自定义过滤器
 * @author acer
 *
 */
@WebFilter(urlPatterns = "/admin/*")
public class LoginFilter implements Filter {

	@Override
	public void destroy() {
		System.out.println("执行filter destroy");

	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		HttpServletRequest req =  (HttpServletRequest) request;
		HttpServletResponse resp =  (HttpServletResponse) response;
		System.out.println("Filter:"+req.getRequestURL());
		if(req.getSession().getAttribute("user")==null){
			resp.sendRedirect(req.getServletContext().getContextPath()+"/index.jsp");
		}else{
			chain.doFilter(request, response);
		}
		
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {

		System.out.println("执行filter init");
	}

}
